Answer this question truthfully
### Question: What causes Miscarriage?
### Response: Most miscarriages are caused by chromosome problems that make it impossible for the baby to develop. Usually, these problems are unrelated to the mother or father's genes.
Other possible causes for miscarriage include:
Drug and alcohol abuse Exposure to environmental toxins Hormone problems Infection Obesity Physical problems with the mother's reproductive organs Problem with the body's immune response Serious body-wide (systemic) diseases in the mother (such as uncontrolled diabetes) Smoking
It is estimated that up to half of all fertilized eggs die and are lost (aborted) spontaneously, usually before the woman knows she is pregnant.
Among those women who know they are pregnant, the miscarriage rate is about 15-20%. Most miscarriages occur during the first 7 weeks of pregnancy. The rate of miscarriage drops after the baby's heart beat is detected.